Fig. 2From: Two-headed mutants of the lamprey, a basal vertebrateTwo-headed lamprey prolarvae. a-h Two-headed mutants after hatching. Identity numbers for each mutants are shown as #01–08. Mutants show various types of defects. For a summary of malformations, see Additional file 1. i A normal prolarva (st. 26). Scale bars: 500 μmBack to article page